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<head>
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    <title>徽章和导航</title>
    <link rel="stylesheet" href="../css/bootstrap.css">
</head>

<body>

    <main>
        <h1>名称<span class="badge badge-secondary">徽章</span></h1>
        <h2>名称<span class="badge badge-secondary">徽章</span></h2>
        <h3>名称<span class="badge badge-secondary">徽章</span></h3>
        <h4>名称<span class="badge badge-primary">徽章</span></h4>
        <h5>名称<span class="badge badge-primary">徽章</span></h5>
        <h6>名称<span class="badge badge-primary">徽章</span></h6>

        <br>
        <a href="#" class="btn btn-secondary">新的消息<span class="badge badge-danger">99</span></a>

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            <ol class="breadcrumb">
              <li class="breadcrumb-item active" aria-current="page">Home</li>
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          <nav aria-label="breadcrumb">
            <ol class="breadcrumb">
              <li class="breadcrumb-item"><a href="#">Home</a></li>
              <li class="breadcrumb-item active" aria-current="page">Library</li>
            </ol>
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          <nav aria-label="breadcrumb">
            <ol class="breadcrumb">
              <li class="breadcrumb-item"><a href="#">Home</a></li>
              <li class="breadcrumb-item"><a href="#">Library</a></li>
              <li class="breadcrumb-item active" aria-current="page">Data</li>
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